Count of rows having different values

Question

SQL>  select  * from med;
CERT  REC  PRIM RACE
100    10   EN   USA
100    11   EN   USA
100    12   EN   USA
100    13   SP   MX
200    14   SP   MX
200    15   SP   MX
6 rows selected.
SQL>  select  * from sub;
CERT  REC PRIM RACE
100    10   EN   USA
100    11   EN   USA
100    12   EN   USA
100    13   SP   MX
200    14   SP   MX
200    15
6 rows selected.
SQL> select  * from den;
CERT  REC  PRIM RACE
100    01   EN   USA
100    02   EN   USA
100    03   EN   USA
100    04   SP   MX
200    06   SP   MX
(cert,rec) uniquly identifies a person;
In Den table rec =med.rec-9 or rec =sub.rec-9 which implies
            med       sub     den
(cert,rec)=(100,10)=(100,10)=(100,01)How can I find out how many people in the table where the PRIM and RACE hold different values.?

Answer 1

Hi,
Perhaps this ,
with med as (
select 100 CERT,   10 rec,   'EN' prim,   'USA' race from dual union all
select 100  ,  11,   'EN',   'USA' from dual union all
select 100  ,  12,   'EN',   'USA' from dual union all
select 100  ,  13,   'SP',   'MX' from dual union all
select 200  ,  14,   'SP',   'MX' from dual union all
select 200  ,  15,   'SP',   'MX' from dual )
sub as (
select 100 CERT,    10 rec ,  'EN' prim,   'USA' race from dual union all
select 100,    11 ,  'EN',   'USA' from dual union all
select 100,    12 ,  'EN',   'USA' from dual union all
select 100,    13 ,  'SP',   'MX' from dual union all
select 200,    14 ,  'SP',   'MX' from dual union all
select 200,    15, null, null  from dual )
den as (
select 100 cert,    01 rec,   'EN' prim,  'USA' race from dual union all
select 100,    02,   'EN' ,  'USA'from dual union all
select 100,    03,   'EN' ,  'USA'from dual union all
select 100,    04,   'SP' ,  'MX'from dual union all
select 200,    06,   'SP' ,  'MX'from dual )
----- sample data
select cert, prim, race ,count(rec) rec
from (
select *
from med
union all
select *
from sub
union all
select *
from den
group by cert, prim, race
ORDER BY 1,2,3
      CERT PR RAC        REC
       100 EN USA          9
       100 SP MX           3
       200 SP MX           4
       200                 1HTH
SS